On adding AgNO₃ solution into KI solution, a negatively charged colloidal sol is obtained when they — Surface Chemistry Chemistry Question

💡 Solution & Explanation

A negatively charged sol of AgI is formed when KI is in excess, leading to preferential adsorption of I⁻ ions. In option D, moles of KI (15 mmol) are greater than moles of AgNO₃ (10 mmol). Therefore, correct answer is D.